Grinding-machine.



110.718,488. PATENTEUJAN. 13, loba.

G. M. LUTHER.

GRINDING MACHINE.

' APPLIOATION PILEDSEPT. ze, 1900. No MODEL. d 2 sHEnTs-imsi.

N' 713,488 PATENTED JANls, 190s. G. M. LUTHER.

GRINDING MACHINE. f

APPLIUATION FILED SEPT. '26, 1900.

No MODEL. n z SHEETS-SHEET 2.

NiTEn 'raras PATENT FFICE.

GEORGE M. LUTHER, MILWAUKEE, WISCONSIN.

emNDlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 718,488, dated January 13, 1903. Application filed September 26, 1900. Serial No. 31,129. (No model.)

To all whom, it may concern:

Be it known that I, GEORGE M. LUTHER, a citizen of the United States, residing at Milwaukee, county of Milwaukee, andY State of Wisconsin, have invented new and useful Improvements in Grinding-Machines, of which the following is a specification.

My invention relates to improvements in sickle-grinding machines, and pertains especially to that class of machines in which the grinding-wheel is supported by a carrier from a swinging yoke, to which it is pivotally secured, Awhereby a horizontal movement of the grinding-Wheel is permitted.

The objects of my invention are-to provide meansfor regulating the stroke and pressure of the grinding-wheel and for rotating -the same without interfering with the reciprocal movement thereof; to provide a form of construction in which the parts may be put together with a minimum amount of machinework; to provide adequate means for holding the sickle, together with means for adjusting the grinding-wheel to the sickle, and to effect certain other improvements in construction hereinafter described and claimed, the purpose of which will be apparent from the description.

In the following description reference is had to the accompanying drawings,in which- Figure l is a side view of my improved sickle-grinder. Fig. 2 is a top view of the same. Fig. 3 is a top view of the sickle-holding clamp. Fig. 4 is a front view of the clampactuating wedge. Fig. 5 is a top view of a modified form of clamp.

Like parts are identified by the same reference characters throughout the several views.

1 is a supporting-frame. 2 is a drive-wheel mounted thereon and adapted to be manually actuated by means of a crank 3.

iis a grinding-wheel supported by a carrier 5, which is pivotally attached at 6 to the swinging yoke 7 and suspended from the npper portion of vthe frame 1.` A rotary motion is communicated to the grinding-wheel 4 from the drive-wheel 2 through the sprocket-chain 9, pinion 10, pivot-shaft 6, and gear-wheels l1 and 12, and a reciprocatory motionA is also communicated to the grinding-wheel from the drive-wheel 2 through its supporting-shaft 13, shifting clutch gear-wheel 15, gear-wheel 16,

eccentric l 7,connectingbar 18, and the swinging yoke and carrier 7 and 5, respectively.

The connecting-bar 18 is arranged to pass through a slot 2O in the yoke 7 and is pivotally secured at. 21 to an adjustable block 22. The latter is formed with an inwardly-projecting portion 23, fitting said slot, and a thumb-nut 25, by means of which the block is ,secured in any desired position of adjustment. The outer face of that portion of the yoke 7 to which the block 22 is secured is curved forwardly, as shown at 8in Fig. l, to compensate for the increased radius of the Vbar 18 as the line of centers approaches the horizontal.

It is obvious that by adjusting the blockl 22 longitudinally of the yoke 7 the range of movement-of the yoke and carrier may be increased or diminished at pleasure. This is of great importance in view of the fact that sickles of different machines are provided with sections of different lengths.

In order to regulate the pressure of the grinding-roller upon the work, I have provided the carrier 5 with laterally-projecting studs 25. An elastic spring-wire 26` is coiled about the pivot-shaft 6,with one end abutting against a shoulder 28 of the yoke and the other end engaging one of the studs 25. The inner end of this wire is contracted and fits an annular groove 29 in the pivot-shaft, thereby not only holding the spring in place, but serving as a key for the shaft itself. It Will be observed that the studs 25 are arranged in a diagonal row along the surface of one of the side arms of the carrier, so that the tension of the spring-Wire 26 is increased or diminished with a corresponding increase or decrease of the pressure of the grindingroller on the Work, according to its position of engagement with the studs. In other words, the pressure of the grinding-roller is at its maximum when the wire 26 is engaged with the uppermost or innermost stud of the series and at its minimum when engaged with the outermost or lower stud of the series.

The shifting gear-Wheel 15 is provided with an elastic bar or Wire rod 30, which is adapted to engage in annular channels 31 in the shaft 13, thus serving as a clutch to hold the shifting gear l5 in its respective positions of adjustment-in mesh and out of mesh with the IOO gear-wheel 16. This gear-wheel 15 is provided with a notch 31 on its inner face, in which an ordinary key 37, inserted through the shaft 13, engages, thus rendering it unnecessary to spline the gear-wheel.

Zhen it is desired to reciprocate the grinding-wheel over the work, the gear 15 is adjusted to the position in which it is shown in Fig. 2, when the gear-wl1eel 16 will be actuated therefrom; but when the reciprocal movement of the grinding-wheel is not desired the gear-wheel l5 is adjusted to the position in which it is shown by dotted lines in Fig. 2. The grinding-wheel may then be held in one position or manually reciprocated by means ot a laterally-prejecting handle 32, or,ifdesired,thegrinding-wheelmaybe raised, as indicated by dotted lines in Fig. 1, when a hook-arm 33, projecting from the carrier 5, engages a counterpart hook 34 on the main frame l and supports the grinding-wheel in a raised position. This adj ustmentis effected when it is desired to use the machine for grinding other tools. In such case the gearwheel 15 must of course be adjusted out of mesh with the gear-wheel 16; but in order` to avoid breaking the machine in case the operator should neglect to disengage the gearwheel15 when the grinding-rollerissupported. by the hook-arm 33 I have constructed the hook on said arm with a tapering face 35, which permits such hook automatically to disengage from the hook 34 whenever the carrier and yoke are actuated through the medium of the eccentric 17.

In order to adjust the grinding-roller to the work, I have constructed the yoke 7 in two sections, secured together by means of a central bolt and nut 36. By loosening the nut it is obvious that the carrier and the lower section of the yoke may be tilted on the bolt 3G and readjusted at any desired angle wiihout interfering with the stability of the machine. The lower section of the yoke is slotted for the passage of the bolt, thus permitting a vertical adjustment for the purpose of tightening or loosening the chain.

The lower portion of the frame is provided with forwardly-eXtending arms 38, connected with a sickle-rest 3f). The arms are recessed or socketed at and adapted to receive the inwardly-projecting studs 4l of a clamping member, the arms 42 of which project forwardly and are adapted to engage the upper surface of a sickle, supported on the sicklerest 39, as shown in Fig. 2. The arms42 of the clamping member are connected by a yoke 43, which passes under the arms 3S, and a swinging lever 44, pivotally secured at to the main frame, projects over the yoke 43 and under the sickle-rest 39.

The under surface ot the sickle-rest is diagonally faced laterally, so that (with the construction shown) if the lever 44 is swung to the left it will be forced downwardly by contact with the diagonal surface 46 of the sicklerest and exerts a downward pressure on the yoke 43. The yoke 43 being connected with the arms 42 of the clamping member in front of the pivot-studs 41, it is obvious that a downward pressure upon the yoke will cause a downward or clamping pressure of the arms 42 upon a sickle, supported by the sickle-rest 39, as shown in Fig. 2. In Fig. 5 the lever 47 is pivotally connected to the yoke at 48 and provided with laterally-projecting arms 49, which are oppositely beveled and adapted, when the lever is swung, to enter the space between the yoke 43 and the arms 3S, thus depressing the yoke and closing the clampingjaws.

One of the arms 42 of the clamping member is pro vided with a rearwardly-extending plate 50, which is adapted to be engaged by a bolt 5l,projecting downwardly from the carrier 5, the purpose of this bolt being to support the grii'iding-roller at the end of its rearward movement. The bolt is adjusted to any desired position by means ot' a thumb-nut 52 and screw-nut 53, cooperating with a lockspring 54. I am thus enabled to cast the carrier 5 with an opening, through which the bolt 5l passes loosely, the nut 53 and spring 54 serving to hold it in the desired position of adjustment.

It will be observed that in turning the crank 3 the hand of the operator is carried into proximity with the sickle, and in order to prevent accidental injuries from contact with the edge of the sickle I have provided a guard 55, which is secured to a bracket 5G, projecting from the clamp member, the guard being in a position to cover the points of the sicklesections on that side of the machine on which the crank is located.

I attach great importance to the use of the chain connection between the drive-wheel 2 and the pinion 10, for while in an ordinary grinding -machine it would be immaterial whether gear or chain connections were used, yet I Iind that in a grinding-machine provided with a carrier supported from a swinging yoke it is necessary to locate one of the gear-wheels of the train on the pivot-shaft, which unites the carrier to the yoke, and ii' ordinary gearing is used for communicating the motion to the pinion on the pivot-shaft the pressure of the gear-teeth will tend to force the yoke forwardly, making the machine difficult to control or operate and making it especially dil'iicult to reciprocate the yoke and carrier by manual pressure exerted either on the yoke, the carrier, or the handle 32, while by providing a cha-in connection between the drive-wheel and the pinion 10 no such forward pressure is found to exist. I also attach great importance to the provision of a strtionary support for the sickle-bar, as the clamping member can thereby be moved into engagement with the sickle Without interfering with its stability.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

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ll. In a grinding-machine, the combination of a grinding-wheel; asupporting-carrier therefor; and a swinging yoke for supporting the carrier; said yoke being formed in sections vsecured together by a central pivot-bolt adapted to permit a tilting adjustment of the carrier and lower yoke-section.

2. In a grinding-machine, the combination of a grinding-wheel; a supporting-carrier therefor; a swinging yoke formed in sections; and a central securing-bolt uniting the sections; one of said sections being provided with a slot for the reception of said bolt whereby the lower section may be tilted, or adjusted vertically.

3. In a grinding-machine, the combination of a grinding-wheel; a supporting-carrier therefor; a swinging yoke supporting the carrier; a driving-wheel operatively connected to rotate the grinding-wheel; an eccentric connected with the yoke; and shifting gear connections between the driving-wheel and the eccentric; together with means for adjusting the connections between the eccentric and yoke to lengthen or shorten the stroke of the latter.

4. In a grinding-machine, the combination of a grinding-wheel; a supporting-carrier therefor; a swinging yoke supporting the carrier; a driving-wheel operatively connected to rotate the grinding-wheel; an eccentricwheel journaled in the machine-frame; shifting gear connections between the drivingwheel and the eccentric; a block adj ustably mounted on the yoke; and a bar connecting said eccentric and block.

5. In agrinding-machine, the combination of a grinding-wheel; a supporting-carrier therefor; a swinging yoke supporting the carrier, and provided with a curved or arched surface; a block adjustably mounted on said curved surface; an eccentric arranged to be actuated from the source of power and connections between saideccentric and block.

6. In a grinding-machine, the combination of a supporting-frame; a drive-wheel mounted thereon and provided with a crank; a shifting gear-pinion on the drive-wheel shaft; a gear-wheel adapted to mesh with the pinion, and provided with an eccentric; a grindingwheel mounted on a carrier; a swinging support for said carrier; a connection between the eccentric and swinging support; and a handle secured to the eccentric supportingwheel.

7. In a grinding-machine provided with a grinding-wheel and means for imparting a rotary motion thereto, the combination of an eccentric; separable connections for driving the saine from the rotatingmechanism of the grinding-wheel; connections between the eccentric and the supporting mechanism of the grinding-wheel; and a handle connected with the eccentric, whereby the reciprocal movement of the grinding-wheel may be either automatic or manually controlled.

S. In a grinding-machine, the combination with asupporting-frame, of a driving-shaft mounted therein; a drive-wheel mounted at one end thereof; an eccentric-wheel mounted on the opposite side of the frame from the drive-wheel and arranged to be driven from said shaft by detachable connections; a handle mounted on the eccentric-wheel; a grinding wheel; and connections between the same and said eccentric-wheel.

9. In a grinding-machine, the combination of a su pporting-frame, ashaft mounted therein; a drive-wheel mounted on the shaft at one side of said frame; a notched pinion loosely mounted on the shaft at the other side of said frame, a key passing through the shaft and adapted to engage in the notch on said pinion, an eccentric-wheel driven from said pinion; and a grinding-wheel connected with said eccentric-wheel. l

'10. In a grinding-machine, the combination of a grinding-wheel supported to o scillate; driving mechanism therefor; an eccentricwheel connected with the grinding-wheel support; and a handle on said eccentric-wheel whereby the same may be actuated independently of the driving mechanism.

l1. In a grinding-machine, the combination with a grinding-wheel supported to oscillate; of an eccentric-wheel connected therewith; a drive-shaft provided with annular grooves; a pinion loosely mounted thereon; a spring connected with said pinion and adapted to t said grooves, and means for holding the pinion to the shaft when the spring engages in one of the grooves, together with gear connections between the pinion and eccentric adapted to be engaged and disengaged by adj usting said pinion on the shaft. A

l2. In a sickle-grinding machine, the combination of a frame provided with a sicklerest; apivotal member provided with a yoke extending underneath the frame, and clamping-arms projecting above the base of the frame near the sickle-rest, and a wedge for separating the yoke and base.

13. In a sickle-grinding machine, the combination of a frame having its basel provided with a sickle-rest, a pivotal member provided with clamping-arms adapted to engage the sickle; a yoke connecting said clamping-arms, and a movable wedge adapted to separate said yoke from aportion of the frame in a direction to press said clamping-arms upon a vsickle supported by the sickle-rest.-

14. In a sickle-grinding machine, the combination of a frame having its base provided with a sickle-rest, a pivotal member provided with clamping-arms; a movable lever provided with laterally-proj ectin g wedge-arms for actuating said member; a rearwardly-extending plate; a grinding-wheel; a carrier therefor; a screw-bolt loosely extended through the carrier and a nut and lock-spring'coperatively located to hold the screw-bolt in a position of adjustment with the lower end thereof adapted to engage said plate and support the carrier.

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15. In a sickle-grinding machine, the combination of a carrier for the grinding-wheel pivotally attached to a swinging support and a spring coiled upon the pivot pin, or shaft, in a position to lock the parts together; one end of said spring being engaged by a shoulder on the swinging support, and the other end being adapted to engage a projection on the carrier.

16. In a sickle-grinding machine, the combination of a carrier for the grinding-wheel pivotally attached to a swinging support, a spring coiled about the pivot pin or shaft, With one end engaging a shoulder on the support, and a series of lateral projections on the carrier each adapted to be engaged by the other end of said spring.

417. In a grinding-machine, the combination of a sickle-rest, a sickle-holding clamp, and a laterally-extending guard adapted to cover GEORGE M. LUTHER. Iitnessesz JAS. B. ERWIN, LEVERETT C. WHEELER. 

